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try to clean the memory slot of your computer as well as the memory module then power up your PC. just do hardware maintenance by means of cleaning all any dust inside the computer. Hope it helps thanks.

The issue seems to be that your PC can not handle the supported memory. After review of your system specs on dell's website, I see that you're computer would require DDR2 Memory. This seems to be what is causing the beeping. Please check to ensure you are using the correct memory stick. I hope this has helped

led 4 is means The computer is in a normaloff condition; the computer isconnected to an electricaloutlethttps://www.manualslib.com/manual/36893/Dell-Precision-Dcd0.html?page=35#manual

1 and 3 illuminate for Memory modules are detected, but a memory configuration or compatibility error exists.

solutions

• Ensure that no special memory module/memory connector placement requirements exist. • Verify that the memory modules that you are installing are compatible with your computer. • Reinstall the memory modules and restart the computer. • If the problem persists, contact Dell. (if have warranty)

But you can install and check one module at a time.if not compatible each other may not display.

OK, i experience this before, i think your situation is mostly like mine, and this problem may cause by the your laptop power adapter, please replace a new adapter and see how is the result. Hope this help.

Plug it back in and attempt to boot. Carefully notice if there are any beeps again, and listen for pauses in between. Dell beep codes go in a three pulse pattern I.E. 4-Slight Pause-4-Slight Pause-2-Pause/ and repeat.

After this, you may have to open your machine and assure that everything is well connected.

There is a chance however that a major system component has failed and needs to be replaced.

If your computer is beeping at you, 9 times out of 10 its going to be an issue with the memory or video. (more often the memory) Try re-seating both. If your still hearing the beep fest, below is a list of the most common beeps and what they
refer to.
This will help you to find out what needs replacing.
Long beep followed by 3 sequential short beeps.
This issue is linked to your Graphic card configurations
Short beep followed by three sequential long beeps
You are facing a system memory problem
Beep- PAUSE- Beep- PAUSE- Two sequential beeps
This error is linked to your CPU
Three beeps-PAUSE-Three beeps-PAUSE-Four beeps
You have an issue with the video memory
Three beeps-PAUSE-Four beeps-PAUSE-Beep
This is linked to an error with your Graphic Card
Four beeps-PAUSE-Three beeps-PAUSE-Beep
You have a system memory problem
Five short beeps
You are facing a problem with your CPU
Long constant beeps
It’s a system memory problem
Short constant and high-pitched beeps
The temperature of your CPU is too high

The IBM Netfinity 5600 is a complicated beast for sure. You really need to get a copy of the Netfinity Manual from IBM (not on the web site fyi.). It's as big as the machine unfortunately. In section 3, p.124 it lists 3-3-3 beep code as "No memory has been detected in the system" solution is "Reseat mem modules or install mem modules. If prob persists get machine serviced." On the previous page, 3 short beeps (only) on POST indicate "system mem error. combo only occurs when video bios cannot display error msg. replace the failing mem module." You might also want to check the light-path diagnostics inside the machine. A little light will be illuminated right beside the bad DIMM.